The SY-1 and SY-2 are the first compact/portable analog synthesizers produced by Yamaha. They are single-VCO synthesizers (derived from the GX-1) with preset sounds and basic synthesis capabilities. As was the trend during the mid-seventies, the SY-1 and SY-2 were designed as accessories to the larger organs and pianos of the time—compact and light enough to sit atop an organ (or piano) and adorned with controls and switches that imitated those found on organs. One listen to the SY-1 or SY-2 and you'll hear the signature classic synth sound that defined Yamaha throughout their more famous CS-series.